diff --git a/source/_components/sensor.london_underground.markdown b/source/_components/sensor.london_underground.markdown
index 45c7cce409b..57a1a5c1a5f 100644
--- a/source/_components/sensor.london_underground.markdown
+++ b/source/_components/sensor.london_underground.markdown
@@ -38,8 +38,11 @@ sensor:
       - Waterloo & City
 ```
 
-Configuration variables:
-
-- **line** (*Required*): Enter the name of at least one line.
+{% configuration %}
+line:
+  description: Enter the name of at least one line.
+  required: true
+  type: list
+{% endconfiguration %}
 
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